These two events have the same display time, but editing one of them will place it at the top, without any obvious cause for readers.
IJmuiden, North Holland, Netherlands / 1st October / 10:00 – 12:00 CEST
Zacatecas, Mexico / 1st October / 10:00 – 12:00 GMT-5
You should keep events with the same display time -including simultaneous events- in the same order (time, or A-Z respectively).
For events with the same display time but different local time, it doesn't make sense to do so.
For events with the same local time, the site has not been for displaying updates to the user directly and users would need an additional hint to know the event has been updated recently. This also allows for pushing events to the top (though this shouldn't happen much in OSM space besides spam events and is most visible for events already at the top of the page).
These events could instead be ordered alphabetically.
(the below and vice versa happens if the other event is edited);
Before
After
I have tried editing an event happening at a different display time and this does not order it differently.
These two events have the same display time, but editing one of them will place it at the top, without any obvious cause for readers.
You should keep events with the same display time -including simultaneous events- in the same order (time, or A-Z respectively).
These events could instead be ordered alphabetically.
(the below and vice versa happens if the other event is edited);
Before
After
I have tried editing an event happening at a different display time and this does not order it differently.